PIC17LC766T-08I/PT - 8-Bit 8MHz 32KB OTP MCU | Microchip
MPN: PIC17LC766T-08I/PT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $13.5 | $13.50 |
| 10 | $12.15 | $121.50 |
| 100 | $10.8 | $1,080.00 |
| 500 | $9.72 | $4,860.00 |
| 1,000 | $8.78 | $8,780.00 |
PIC17LC766T-08I/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and programmable peripherals. The PIC17C family sits at the high end of Microchip's classic 8-bit portfolio, pairing RISC instruction-set efficiency with 16-bit-wide program memory to deliver compact code density and deterministic execution. PIC17C MCUs are typically deployed in industrial control, instrumentation, and embedded designs that demand more compute, memory, and I/O than entry-level PIC16 devices can provide.
Key features of the PIC17LC766T-08I/PT include 33 digital I/O lines, an 8 MHz oscillator yielding 121 ns single-cycle instruction execution, 58 single-word instructions, hardware multipliers, multiple timer/counter modules, and a synchronous serial port. The OTP program memory supports one-time field programming, while the TQFP-80 footprint exposes the full peripheral set including external interrupt, capture/compare/PWM, and USART interfaces. The wide 3.0–5.5 V supply tolerance simplifies mixed-voltage system design.
Architecturally, the PIC17C766 core is a Harvard-style design with separated program and data buses, an 8-level hardware stack, and direct interrupt handling. The OTP program array is 16 bits wide, which doubles code density relative to 14-bit PIC16 devices. Operating at 8 MHz, most instructions complete in a single 121 ns cycle; program branches and table reads/writes require two cycles. This deterministic timing makes the PIC17LC766T-08I/PT well suited to real-time control loops where predictable latency matters more than raw throughput.
Typical applications include industrial automation controllers, instrumentation front-ends, motor control peripherals, embedded sensor hubs, white-goods control boards, and legacy 5 V factory equipment retrofits. The 32 KB OTP allows substantial application logic, state machines, and protocol stacks to be stored on-chip.
When designing with this part, note that OTP memory cannot be re-programmed, so choose this variant for production; consider the JW (windowed) or QTP/SQTP equivalents for prototyping. The TQFP-80 footprint requires careful PCB thermal and signal-integrity planning for the high-pin-count interface.
This page consolidates distributor pricing, pin-compatible alternatives, application guidance, and design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for PIC17LC766T-08I/PT — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC17LC766T-08I/PT (same form factor and footprint) — differing in Package, Core Architecture, Operating Temperature, Program Memory Size, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC17LC766-08I/PT
✅ Drop-In✓ In Stock
$11.5 / Unit
View Datasheet →PIC17LC766-08I/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$10.85 / Unit
View Datasheet →PIC17LC766T-08/L
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9.85 / Unit
View Datasheet →PIC17LC766-08/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC17LC762-08I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.4 / Unit
View Datasheet →PIC17C766-16I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$11.5 / Unit
View Datasheet →PIC17LC766T-08I/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC17C, 8-bit RISC |
| Instruction Set Width | 16-bit (program memory) |
| Number of Instructions | 58 single-word instructions |
| Maximum Clock Speed | 8 MHz |
| Instruction Cycle Time | 121 ns (single-cycle) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 32 KB (16K x 16) |
| RAM Size | 902 bytes |
| Data EEPROM | Not specified (no on-chip EEPROM listed) |
| I/O Pins | 33 |
| Supply Voltage (Vdd) | 3.0 V to 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Package | 80-TQFP (12x12 mm) |
| Mounting Type | Surface Mount |
| Pin Count | 80 |
| Packaging | Tape & Reel |
| RoHS Status | Compliant (per Microchip product page) |
PIC17LC766T-08I/PT Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 3 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 4 | RA3/AN3 — PORTA bit 3 / Analog input 3 |
| Pin 5 | RA4/AN4 — PORTA bit 4 / Analog input 4 |
| Pin 6 | RA5/AN5 — PORTA bit 5 / Analog input 5 |
| Pin 7 | RA7 — PORTA bit 7 |
| Pin 8 | RA6 — PORTA bit 6 |
| Pin 9 | OSC1 — Crystal oscillator input |
| Pin 10 | OSC2 — Crystal oscillator output |
| Pin 11 | MCLR — Master clear (reset) input |
| Pin 12 | VSS — Ground |
| Pin 13 | VDD — Positive supply |
| Pin 14 | VSS — Ground |
| Pin 15 | VDD — Positive supply |
| Pin 16 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 17 | RB1 — PORTB bit 1 |
| Pin 18 | RB2 — PORTB bit 2 |
| Pin 19 | RB3 — PORTB bit 3 |
| Pin 20 | RB4 — PORTB bit 4 |
| Pin 21 | RB5 — PORTB bit 5 |
| Pin 22 | RB6 — PORTB bit 6 |
| Pin 23 | RB7 — PORTB bit 7 |
| Pin 24 | RC0 — PORTC bit 0 |
| Pin 25 | RC1 — PORTC bit 1 |
| Pin 26 | RC2 — PORTC bit 2 |
| Pin 27 | RC3 — PORTC bit 3 |
| Pin 28 | RC4 — PORTC bit 4 |
| Pin 29 | RC5 — PORTC bit 5 |
| Pin 30 | RC6 — PORTC bit 6 |
| Pin 31 | RC7 — PORTC bit 7 |
| Pin 32 | VSS — Ground |
| Pin 33 | VDD — Positive supply |
| Pin 34 | RD0 — PORTD bit 0 |
| Pin 35 | RD1 — PORTD bit 1 |
| Pin 36 | RD2 — PORTD bit 2 |
| Pin 37 | RD3 — PORTD bit 3 |
| Pin 38 | RD4 — PORTD bit 4 |
| Pin 39 | RD5 — PORTD bit 5 |
| Pin 40 | RD6 — PORTD bit 6 |
| Pin 41 | RD7 — PORTD bit 7 |
| Pin 42 | VSS — Ground |
| Pin 43 | VDD — Positive supply |
| Pin 44 | RE0 — PORTE bit 0 |
| Pin 45 | RE1 — PORTE bit 1 |
| Pin 46 | RE2 — PORTE bit 2 |
| Pin 47 | RE3 — PORTE bit 3 |
| Pin 48 | RE4 — PORTE bit 4 |
| Pin 49 | RE5 — PORTE bit 5 |
| Pin 50 | RE6 — PORTE bit 6 |
| Pin 51 | RE7 — PORTE bit 7 |
| Pin 52 | RF0 — PORTF bit 0 (multiplexed) |
| Pin 53 | RF1 — PORTF bit 1 (multiplexed) |
| Pin 54 | RF2 — PORTF bit 2 (multiplexed) |
| Pin 55 | RF3 — PORTF bit 3 (multiplexed) |
| Pin 56 | RF4 — PORTF bit 4 (multiplexed) |
| Pin 57 | RF5 — PORTF bit 5 (multiplexed) |
| Pin 58 | RF6 — PORTF bit 6 (multiplexed) |
| Pin 59 | RF7 — PORTF bit 7 (multiplexed) |
| Pin 60 | RG0 — PORTG bit 0 |
| Pin 61 | RG1 — PORTG bit 1 |
| Pin 62 | RG2 — PORTG bit 2 |
| Pin 63 | RG3 — PORTG bit 3 |
| Pin 64 | RG4 — PORTG bit 4 |
| Pin 65 | VSS — Ground |
| Pin 66 | VDD — Positive supply |
| Pin 67 | TX/CK — USART transmit / clock line |
| Pin 68 | RX/DT — USART receive / data line |
| Pin 69 | SCK — Synchronous serial clock |
| Pin 70 | SDI — Synchronous serial data in |
| Pin 71 | SDO — Synchronous serial data out |
| Pin 72 | CCP1 — Capture/Compare/PWM channel 1 |
| Pin 73 | CCP2 — Capture/Compare/PWM channel 2 |
| Pin 74 | T0CKI — Timer0 clock input |
| Pin 75 | T1CKI — Timer1 clock input |
| Pin 76 | T2CKI — Timer2 clock input |
| Pin 77 | VSS — Ground |
| Pin 78 | VDD — Positive supply |
| Pin 79 | AVSS — Analog ground |
| Pin 80 | AVDD — Analog positive supply |
Typical Applications
PIC17LC766T-08I/PT is suitable for 6 applications: Industrial Automation Controller, Instrumentation and Metering Front-End, White Goods and Appliance Control, Motor Control Peripherals, Embedded Sensor Hubs, Legacy 5 V Retrofit Designs.
Industrial Automation Controller
The PIC17LC766T-08I/PT suits industrial automation controllers because its 32 KB OTP program memory can host substantial state-machine logic for PLC-style I/O scanning, while its 33 digital I/O lines directly drive sensors, relay coils, and opto-isolated inputs. The deterministic 121 ns single-cycle instruction execution ensures predictable loop timing for PID control, and the -40 °C to +85 °C industrial temperature grade tolerates factory-floor thermal stress. The 3.0–5.5 V supply range accepts both legacy 5 V and modern 3.3 V rails commonly found on PLC backplanes. Compared with entry-level PIC16 parts, the PIC17C766 delivers roughly twice the code density and more interrupts, simplifying real-time response on multi-axis machines.
Recommended
Instrumentation and Metering Front-End
The PIC17LC766T-08I/PT is a strong fit for instrumentation front-ends where the MCU must read sensors, drive LCD or LED displays, and execute calibration math without external memory. Its 902 bytes of RAM is sufficient for moving-average filters and lookup tables used in temperature, pressure, and flow metering, while the 8 MHz clock delivers 121 ns instruction cycles that allow oversampling for 12–16 bit ADC averaging. The PIC17C core's 16-bit program memory word keeps numerically intensive calibration routines compact, and the 33 I/O lines easily connect to segmented displays, rotary encoders, and isolated UART links. The wide 3.0–5.5 V supply simplifies battery-backed meter designs that share a coin cell and a 5 V analog front-end.
Recommended
White Goods and Appliance Control
The PIC17LC766T-08I/PT has long been deployed in washing-machine, dishwasher, and oven controllers where reliability under motor noise and temperature extremes is essential. Its -40 °C to +85 °C industrial temperature range tolerates the high-heat environment inside an appliance cabinet, and the 33 I/O lines drive triac interfaces, keypads, and seven-segment displays directly. The 32 KB OTP accommodates full appliance state machines, fault logging, and user-interface logic in a single chip, reducing BOM cost. Compared with newer Flash parts, OTP is actually a security advantage: it prevents reverse-engineering of proprietary wash-cycle algorithms and reduces field reprogramming risk.
Recommended
Motor Control Peripherals
For brushed-DC and stepper-motor peripheral control, the PIC17LC766T-08I/PT offers on-chip timers and a capture/compare/PWM module that generate accurate switching waveforms at 8 MHz. The 121 ns instruction cycle lets designers run closed-loop commutation algorithms with sub-microsecond jitter, while 33 I/O lines handle Hall-sensor inputs, enable signals, and fault flags. The wide 3.0–5.5 V supply lets the same MCU run from either 24 V industrial bus-derived 5 V or 3.3 V logic, and the industrial temperature grade survives under-hood thermal load. OTP prevents firmware tampering in cost-sensitive drives.
Recommended
Embedded Sensor Hubs
The PIC17LC766T-08I/PT works well as a multi-sensor hub that aggregates temperature, humidity, and switch inputs over UART, SPI, or I²C links to a host processor. Its 33 I/O lines multiplex several SPI peripherals, while the 8 MHz core services multiple polled sensor channels within tight timing windows. The 902 B RAM buffers short data bursts before relaying them upstream. Industrial temperature tolerance allows outdoor enclosure placement, and the OTP variant reduces the risk of unauthorized firmware replacement in deployed sensor networks.
Recommended
Legacy 5 V Retrofit Designs
The PIC17LC766T-08I/PT is a favored replacement MCU in 5 V legacy retrofits, including older telecom line cards, industrial test rigs, and military COTS modules that must remain electrically compatible with existing boards. Because the PIC17C family has been in continuous production for decades, Microchip typically guarantees long-term availability, making the LC766 an ideal pin-compatible modern substitute for end-of-life predecessor parts. The 3.0–5.5 V supply tolerance matches 5 V rails directly, and the 80-TQFP footprint allows direct PCB drop-in without re-layout.
Recommended
Recommended Products Summary
Engineering reference data for PIC17LC766T-08I/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC17LC766-08I/PT | PIC17LC766-08I/L | PIC17LC766T-08/L | PIC17LC766-08/PT | PIC17LC762-08I/PT | PIC17C766-16I/PT |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 80-TQFP (12x12) | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same | 80-TQFP (12x12) - same |
| Program Memory | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 32 KB OTP | 16 KB OTP | 32 KB EPROM |
| Maximum Clock Speed | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 8 MHz | 16 MHz |
| Program Memory Type | OTP | OTP | OTP | OTP | OTP | OTP | EPROM (windowed) |
| Supply Voltage | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 3.0 - 5.5 V | 4.5 - 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C | -40 °C to +85 °C | 0 °C to +70 °C (Commercial) | 0 °C to +70 °C (Commercial) | -40 °C to +85 °C | -40 °C to +85 °C |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Packaging Media | Tape & Reel | Tray | Tray | Tape & Reel | Tray | Tray | Tray |
Key Differentiators
- Tape & Reel packaging for high-volume SMT assembly (vs PIC17LC766-08I/PT)
- Industrial temperature grade (-40 °C to +85 °C) (vs PIC17LC766T-08/L)
- Same-family 80-TQFP compatibility across speed grades (vs PIC17C766-16I/PT)
Design Notes
Decouple every Vdd/Vss pair with a 100 nF ceramic capacitor placed within 5 mm of the IC pins, plus a single 10 µF tantalum or aluminum bulk capacitor on the board to handle switching transients from the MCU's PWM and timer outputs. Because the PIC17C core can source/sink 25 mA on individual I/O lines and up to 200 mA total, ensure the regulator has at least 250 mA headroom beyond the rated Vdd current. Keep AVDD and AVSS separated from digital Vdd/Vss with ferrite beads if your design uses ADC channels.
Route the 8 MHz crystal traces (OSC1/OSC2) symmetrically and keep them short, with ground guarding on both sides to avoid coupling noise into the high-impedance oscillator. Place MCLR with a 10 kΩ pull-up and a 100 nF decoupling cap directly at the pin. The 80-TQFP has many ground pins (VSS) — connect them all to a single uninterrupted ground plane to minimize ground bounce during high-current switching. Avoid running noisy switching traces beneath the IC's analog PORTA pins.
OTP memory cannot be re-programmed, so verify your hex file thoroughly on a windowed PIC17C766-16I/PT prototype before committing production runs. Do not exceed the absolute maximum Vdd of 6.5 V even momentarily, because the LC variant has lower voltage tolerance than the standard PIC17C766. Ensure your programmer supports the PIC17C device ID (0x0B2x) and the proper high-voltage entry sequence, or programming will fail silently. Finally, remember that branches and table reads/writes take 2 cycles, not 1 — account for this when computing instruction timing loops.
Compliance Information
RoHS and Pb-free compliant per Microchip product page; not AEC-Q100 qualified — choose PIC17C766 automotive variants for vehicular applications.
